Rotation mechanism for percussive drills.



L. C. BAYLES.

ROTATION MECHANISM FOR PERCUSSIVE DRILLS.

' APPUCATloN FILED AuG.14.1912.

1,148,649, n PmntedAug. 1915,'

M 3 SHEETS- SHEET x.

L. C. BAYLES.

' ROTATION MECHANISM FOR PERCUSSIVE DRLLS.

APPLICATION FILED AUG. I4, |912.

1148,49. PaIenIedAug. '3,19154 3 EEEEEEEEEEEE 2.

` /A/VE/VTOH Mm w MWA C, swg fwn? @ma y A TTOHNEY L. C. BAYLES.

ROTATION NIECHANISM FOR PERCUSSIVE DRILLS.

` APPLICATION FILED AUG. I4.'I9I2.

1,148,649 Patented Aug'. 3, 1915.

3 SHEETS-SHEET 3.

` STATES' PAv NT LEWIS c. :BAYLEs, or EASTON, PENNSYLVANIA, AssIGNOE rro INGERsoLri-RANn COMPANY, OE NEW YOEK,'N. Y., A CORPORATION O E NEW JERSEY'.

Specicatiim of Letters Patent.

Patented Aug. 3, 1915.

Applicationled August 14, 1912. Serial No. 715,010.

To all whom it may concern.'

Be it known that I, LEWIS C. BAYLES, a citizen of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Rotation Mechanism for Percussive Drills, of which the following is a specification.

This invention relates to rotation mechanisms for percussive drills and more particularly to that type of rotation mechanism wherein 'the rotation is effected by the movement of the drill, piston.

The object ofthe invention-is to produce,A a simple a'nd effective mechanismwhich is all contained in the forward partito the drill cylinder, thus obviating the necessity of the usual rifle bar and ratchet in the back end of the cylinder. With this object in view, I have devised a mechanism a practical embodiment of which is. shown in the accompanying drawings, in whichf Figure 1 is an elevation of the lcomplete drill. Fig. 2 is a longitudinal section on ,the line .Or-2 of Fig. 1. Fig. `3 is a transverse section on the line 3-3 of Fig. 2.

Fig. 4 is a transverse section on the line 4-4 of Fig. 2; Fig. 5 is a `detail View showing the piston.. in elevation, and Figs. 6, 7 and 8 are diagrammatic views showing the operation ofthe rotation mechanism.

As shown the drill comprises acylinder 1 in which is located thetpiston 2 which actuates by its impact the drill steel 3. The reciprocation ofV the piston is .controlled by a Valve (not shown) operating in a valve chest 4, the construction and operation of A vthe valve forming no part ofthe present invention. consists of an elongated shank 5, the forward end of which` is grooved :leaving a series of longitudinal wedge shaped flutes 6 Aeach hai ing a long face 7 set at an angle to the lino of the piston, and a 2shorter face 8 set at an opposite angle to the `piston line.

VThe forward ends of these flutes G slide in correspondingly shaped but wider grooves 9- on the inner surface` of a' drill rotating l chuck l0 isa pawl ring 11 which surrounds:

chuck 10, the faces of the grooves contacting with the faces 7 being set at the same angle to the piston line. The chuck 10 is rotatably mounted in the forward part 10l ofthe drill casing and is provided with a lchuck aperture into which' the shank of the drill steel slides. Immediately, tothe rear of the The forward end of the piston` the forward end of the piston and also has grooves 12 in it, which have faces contacting with `the .faces 7 of the piston and set at the same angle to the piston line. The

pawl ring 11 is angularly movable relatively j to the chuck 10 but the forward rotation of the ring 11,.-relative to the chuck is Opposed by a spring 13, the ends of ,which abut against shoulders 13a in the faces of the chuck ring and chuck, this spring being compressed by forward movement of the Achuck ring relative to the chuck and when so compressedtending to move the chuck forward lalso.

The pawl ring is mounted for rotationy in one direction inthe drill casing, movement in the other direction beingiprevented by ratchet .teeth 14 on the inner surface of a ratchet ring 15 which are engaged by spring pressed pawls 16 in the pawl r-in 11.

The ratchet ring 15 is frictiona ly heldin `place between the cylinderlV and the forward part 10n of the drill casing,` the parts. being held together resiliently by means of bolts 17 and springs 18. This allows the ring 1.5 to slip slightly if an undue straih'nis put on the steel in turning it, which ;some

times occurs when the steel becomes wedged 1n the hole and it isnecessary to turn the drill to eXtricate it..

The operation of the device which can be clearly seen in Figs. 6-8 is as follows: Supposing the piston to bel at the end vof its back stroke and the parts in the positions shown in Fig. 6,A as the piston moves forward the long face 7 of the piston flute engages .one

face of the groove in the pawl ring 11 The jpawl,l ring is arranged so that it can "moveonly in the direction-of the arrow, consequently the piston will be rotated slightly,

slant of the two faces will lcause the chuck motion of the piston 'through'a 10 'angle will cause this much additional rotation, the total effect beingl that the.l drill 'steel chuck and therewith the. steel yare movedv ,i i

As the piston moves forwardv the relative'- to rotate say 10 while a't the sametimethe i through ari-angle of1-sa.y:2l0,"' theparts at ytheend of 'theforward stroke beingiri the position showninlFig. On' the lnext back4 stroke ofthe yp'istonythe steel, being in con vtact with the rock,` will remain stationary as will the chuck 10, as the face 7 of the piston -[iut-e recedes, the pawlfring willfollow it by reason of'the tension of the spring 13. The' spring will also cause the short face 8.of the piston flute to be. kept in close Contact with the adjacent face o f the chuck groove 12, and thus as the piston moves back it will b e turned-through anfangle of 10 by the action of the spring, .the pawlring at the .saine time moving through an angle of and overtaking again the chuck l0. This brings the parts in theposition shown in Fig. 8, where they,` are in the saineirelative position as shown in Fig. 6. but moved through an angle of 20 inthe cylinder.. On the neXt stroke of the piston, forward and back, the whole combination, Will be again Irotated through a likeagle' of 20, the piston and steel rotating on the forward stroke and the piston and pawlv ring rotating on the back stroke.

It is to be observed that the only operativefaces on the paWl-ring and drill steel chuck are those engaging respectively fthefaces Tand 8 ofthe istoii flute, and the shape and `direction of) any other surfaces of the ring and chuck, suchl as thevother faces of the ,grooves therein are immaterial.

ln thev deviceas shown thepavvls. are shown on theA ring rotating with the piston and the ratchet on the inner surface of-the drill-casing. It is evidentthat theselcould be reversed` Without invention.

rotation, a faceA on said navvl ring at an angle tosaid chuck face, and a flute onsaid piston having facesengaging said chuck and pavvl ring faces torotate said chuck.

2. ln a percussive drill, a cylinder, Vits piston, revoluble drill steel chuck having ai facey atfan angle to the line of the'fpistongva paivl ring rotatable relatively to'f'said chuck, resilient means opposing said relative rotation, a face on said pawl ring at anfaigle to said chuck face, and a flute on said pis- 'l ton having faces engaging saidy chuck and pawl ring faces'to rotate said chuck.

ln percussive drill, a cylinder, its iston, a *"ie'voliible drill steel chuck havingA a faceatfan' angle 'to the piston line,ja p'awl ring rotatablefrelatively to said chuck, lsaid chuck and-pawl ring having a resilientconA ncction opposing relative rotation and causofthe forward casing.-

ing saidpawl ring to follow the rotation fof the said chuck, said pawl ring having a face at an angle to said chuck face, and a Hte on. said piston having faces` engaging said. chuck and `pavvl ring faces to rotate said chuck.

1. In a percussive drill, a cylinder, its piston, a revoluble drill steel chuck having a face at an angle to the piston line,a pawly ring rotatable relatively to said chuck, said 'l chuck and paWl ring having a resilient connection opposing relative rotation and causing said pavwl ring to follow the rotation of the saidv chuck, said pawl ring having a face said piston having faces engaging said chuck. and pawl. ring faces to rotate said chuck, said resilient connection serving to rotate the piston on its stroke in one direction.

'at an angle tov said chuck face, and a flute on 5. In a percussivedri'll, a cylinder, its pisi ton, a revoluble drill steel chuck having a face at an angle to the piston line, a-ring rotatable A'relatively to said chuck and having ratchet connection with the drill. cylinder, said chuck and ring having a resilient connection opposing'relative rotation, a face on said ring oppositely inclined to said chuck face, and a flute on said piston havingfaces engaging said chuck and'ring faces to rotate said chuck.

6. In' a percussive drill, a cylinder, its piston, a -revoluble drill steel chuck having a face atan angle to thepiston line, a ring ,rotatable relatively to said-chuck and having ratchetconnection With-the drill cylin-V der, said chuck and ringV having a resilient connection opposing relative rotation, a face on said ring oppositely inclined to said chuck face, and a iiiite on said piston having faces engaging said chuck/and ring faces to.

rotate said chuck, said resilient connection serving to "rotate said piston on its stroke in one direction. l y 7. ln a perciissive drill, a cylinder, a pis- -ton havinga fluted forward end', a paivl ring `surrounding said piston and in sliding engagementV therewith, a ratchet ring for said pawl ring, said-ratchet ringbeing friction'allyheld againstrotation. y8. Ina percussive `drill, a.- cylinder, a forwardcasing divided into two portions, a

piston having a liiited forward end, a pawl ring surrounding said piston and. in sliding engagement therewith, a ratchet ring for said pawl ring, said ratchetring being frictionally secured between said tivo portions In testimony whereof, l have hereunto set R. H. Winnende.

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